Reddit mentions of CableJive dockStubz+ Charge Converter and 30-pin Pass Through Adapter and Power Injector for Legacy iPhone, iPod, and iPad

You could maybe try an adapter, I have an iPod nano that wouldn't charge so I bought an adapter, I'm not sure how that would work with the lightning to 30 pin though. Here's a link to the one I bought, maybe it'll set you on the right track.
https://www.amazon.ca/dp/B003TJR2HS/ref=cm_sw_r_em_apa_YMP9ybXKTWWNR

Hope this helps

Careful with the age of your 30 pin connector device. At some point they switched the power pin so the Bluetooth adaptor might not get power if your device is too old (like my Apple HiFi). Another dongle to the rescue: http://www.amazon.com/CableJive-dockStubz-Converter-Through-Adapter/dp/B003TJR2HS

I have that paired with a Bluetooth adapter like OPs and it was totally worth the $50 total I paid.

My head unit is the stock CD player one

When I bought it, it has this connected behind it:

https://www.ebay.co.uk/itm/322083570596

But the ipod connected was torn to shreds so bought a replacement

Ipod connects fine as mentioned before thinking it is a cd changer, can skip track etc through the steering wheel, which I guess is the added benefit of using that device instead of just an aux cable

The iPod would connect, but not charge, giving the 'not charging' message on the iPod screen, so I got this adapter which now lets it charge when connected:

https://www.amazon.co.uk/dp/B003TJR2HS/ref=cm_sw_r_cp_tai_SeRyzbTH8DH6M

Will check out the aux only connection on the head unit if the aux level doesn't work for increasing the volume a bit on the iPod though

OK, here is what I use... Amazon Links: https://www.amazon.com/Bluetooth-Adapter-Cooper-iPhone-CoolStream/dp/B017RWJ46O/ref=sr_1_16?keywords=coolstream+bluetooth&qid=1562714825&s=gateway&sr=8-16

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https://www.amazon.com/CableJive-dockStubz-Charging-Adapter-Black/dp/B003TJR2HS/ref=sr_1_1?keywords=dockstubz+cable+jive&qid=1562714965&s=gateway&sr=8-1

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You'll need both as the stock iPhone cable does not supply enough power.

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And here is my DIY on MyG37.com https://www.myg37.com/forums/audio-video-and-electronics/283891-new-solution-for-connecting-android-to-09-bose-nav-and-use-steerng-wheel-contr.html